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afb7da86 - [`FastAPI`] Stabilize `fast-api-unused-path-parameter` (`FAST003`) (#16625)

[`FastAPI`] Stabilize `fast-api-unused-path-parameter` (`FAST003`) (#16625) ## Summary Stabilizes FAST003, completing the group with FAST001 and FAST002. ## Test Plan Last bug fix (false positive) was fixed on 2025-01-13, almost 2 months ago. The test case was already in the right place.